Thanks for the patch!
> +test:do_test(
> + "builtins-4.6",
> + function()
> + local res = {pcall(box.execute, [[SELECT LENGTH(?);]], {1})}
> + return {tostring(res[3])}
Don't we usually use do_catchsql_test for such tests? The same for
4.9, 4.13, 4.14.